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ABSTRACT

PEROXIDE CURED POLYETHYLENE HOMO-AND COPOLYMERS HAVING IMPROVED PHYSICAL PROPERTIES, I.E. GREATLY REDUCED VOID FORMATION AND INCREASED CURE RATE AND STATE, ARE PREPARED BY INCORPORATION OF MINOR AMOUNTS OF EPDM&#39;&#39;S AND/OR COAGENTS SUCH AS TRIALLYL CYANURATE, TRIMETHYLOL PROPANE TRIMETHACRYLATE, ETHYLENE DIMETHACRYLATE, MPHENYLENE BIS MATEIMIDE, ETC. THESE CURED POLYMERS ARE USEFUL AS ELECTRICAL INSULATORS, E.G. FOR HIGH VOLTAGE WIRE AND CABLE.

DEFENSW Ulllfll UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 O.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The flies of these applications are available to the publlc for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Ofllce makes no assertion as to the novelty of the disclosed subject matter;

PUBLISHED JULY 25, 1972 T900,019 POLYETHYLENE John J. Murphy, In, 719 Springfield Ave., Cranford, NJ. 07016; Winthrope C. Smith, 430 Kimball Ilurn, Westfield, NJ. 07090; and William D. Marsh, 91 Cranford Ave., Cranford, NJ. 07016 Filed Apr. 19, 1971, Ser. No. 135,207 Int. Cl. (308E 27/00, 29/04 US. Cl. 260-878 R 2 Sheets Drawing. 17 Pages Specification CURE CURVES UNCOAGENTED LDPE VS LDPE COAGENTED WITH TAC l I l l l MONSANTO RHEOGRAFH TEMPERATURE 400F OSCILLATION i0 CPM ARC 3 rescue (men Pounce! a a b i s 4 i MINUTES AT coo'F Peroxide cured polyethylene homoand copolymers having improved physical properties, i.e. greatly reduced void formation and increased cure rate and state, are prepared by incorporation of minor amounts of EPDMs and/or coagents such as triallyl cyanurate, trimethylol propane trimethacrylate, ethylene dimethacrylate, mphenylene bis maleimide, etc. These cured polymers are useful as electrical insulators, e.g. for high voltage wire and cable.

Filed April 19, 1971 TORQUE (INCH POUNDS) J. J. MURPHY, JR ETAL POLYETHYLENE 2 Sheets-Sheet 1 FIGURE I IMPROVEMENT IN LDPE CURE WITH TAC l l I MONSANTO RHEOGRAPH A LAB COMPOUND MINUTES AT 400F John J. Murphy, Jr. Win/hrope C. .Sm/fh INVENTORS Will/am D. Mars/7 BY 7AM 4A ATTORNEY July 25, 1972 J. J. MURPHY, JR., L

POLYETHYLENE Filed April 19, 1971 2 Sheets-Sheet 2 FIGURE 2 CURE CURVES UNCOAGENTED LDPE VS LDPE COAGENTED WITH TAC I I I I I MONSANTO RHEOGRAPH TEMPERATURE 400F OSCILLATION IO CPM ARC 3 TORQUE (INCH POUNDS) MINUTES AT 400 F John J. Murphy, I/r. W/nf/Irope C. Smith INVENTORS William 0. Mars/1 BY ATTORNEY 

